feat(database): Oracle data source support (#1510)

Adds Oracle as a data source through rust-oracle (ODPI-C), which loads the user's
Oracle Instant Client at runtime; the client is not bundled. The Options tab takes
the Instant Client directory (empty: ORACLE_HOME or the system library path).
Covers connecting, the schema tree, consoles with PL/SQL blocks, table editing,
Generate DDL (DBMS_METADATA), Explain Plan (PLAN_TABLE), Oracle-specific SQL
generation and completion, and jdbc:oracle:thin URLs.

Review fixes: PL/SQL units keep their closing END; (the server rejects a block
without it), a subprogram's declarations no longer split it, and packages end at
a / line; LOB cells are read through locators (they showed as null and broke
Generate DDL); ORA-01005 prompts for a password; the Instant Client directory is
optional in the dialog.

Co-authored-by: boenkkk <[email protected]>

src/features/database/sql/complete.ts

@@ -68,9 +68,12 @@ export function quoteIdent(name: string, driver: DbDriver): string {
   const plain =
     driver === "postgres"
       ? /^[a-z_][a-z0-9_$]*$/
-      : driver === "clickhouse"
-        ? /^[A-Za-z_][A-Za-z0-9_]*$/
-        : /^[A-Za-z_][A-Za-z0-9_$]*$/;
+      : // Oracle folds unquoted names to upper case; a lower-case name must stay quoted.
+        driver === "oracle"
+        ? /^[A-Z_][A-Z0-9_$]*$/
+        : driver === "clickhouse"
+          ? /^[A-Za-z_][A-Za-z0-9_]*$/
+          : /^[A-Za-z_][A-Za-z0-9_$]*$/;
   if (plain.test(name) && !isReserved(name)) return name;
   if (driver === "clickhouse") return `"${name.replace(/\\/g, "\\\\").replace(/"/g, '\\"')}"`;
   const q = driver === "mysql" ? "`" : '"';